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1Crocee Paper Template Proceedings of 1st Croatian Conference on Earthquake Engineering, 1CroCEE Zagreb, Croatia - March 22nd to 24nd, 2021 Edited by Laksusic, S. and Atalic, J. Copyright © 2021 CroCEE PETRINJA M6.2 EARTHQUAKE IN 2020 DAMAGED ALSO SOLID LINEAR INFRASTRUCTURE: ARE THERE SIMILAR ACTIVE FAULTS IN CROATIA? Tvrtko Korbar1*, Snježana Markušić2, Davor Stanko3, Davorin Penava4 1 Croatian Geological Survey, Department of Geology, Zagreb, Croatia; [email protected] 2 University of Zagreb, Faculty of Science, Department of Geophysics, Zagreb, Croatia; [email protected] 3 Faculty of Geotechnical Engineering, University of Zagreb, Varaždin, Croatia; [email protected] 4 Faculty of Civil Engineering and Architecture Osijek, Josip Juraj Strossmayer University of Osijek, Croatia; [email protected] Abstract On 29 December 2020 devastating M6.2 earthquake hit well known Petrinja epicentral area, and caused strong damage on many buildings in Petrinja, Sisak, and Glina, as well as on solid modern linear infrastructure (roads, bridges, artificial river embankments, pipelines etc.). The seismic hazard is not depending only on the estimated coseismic ground acceleration that should be used for EUROCODE 8 constructional seismic design, but is also strongly dependent on local soil effects and on the secondary effects of a strong earthquake (landslides, liquefaction, suffosion, etc.). Besides, movement of the crustal blocks along the fault lines that cross the solid objects, in case of surface coseismic rupture such was the Petrinja event, should be evaluated. Local site amplification effects are the results of several physical processes (multiple reflections and diffractions, focusing, resonance, wave trapping) in the overlying superifical deposits and soil, resulting in variable damage distribution that were observed in different local geological units affected by an earthquake. Also, the variable surface topography and various mechanical properties of the terrain such as water table, slopes, presence of heterogeneities, structural discontinuities and cavities, certainly can contribute to the observed damage and increase geological hazard in epicentral area. How many unknown active faults we can identified in Croatia? What could be surface manifestation of a strong earthquake that will occure on a shallow thrust (reverse) fault? Is there any major normal active fault that can surprise seismotectonic experts and civil engineers? The authors published first scientific paper after the Zagreb 22 March 2020 event and are currently working on active tectonics in Kvarner region and Hrvatsko Zagorje. Besides, a new Croatian Science Foundation (HRZZ) project has just been started with special attention on soil dynamic properties and its influence on the seismic hazard of the older cultural buildings in Trakošćan, Šibenik and Dubrovnik. Keywords: active tectonics, strike-slip faults, earthquake, coseismic surface ruptures, linear infrastructure, EUROCODE 8, seismic hazard. 1. Introduction The devastating earthquake (mainshock) of the Petrinja (Croatia) 2020 seismic sequence was on 29 December 2020 with the magnitude of 6.2 and estimated intensity of VIII-IX °EMS [1]. The mainshock caused considerable damage and numerous ground failures, mostly due to the local site effects. Considering the fact that surface ruptures occurred, there was also a significant damage on the structures crossing activated faults from the fault system. Based on the preliminary geological analyses, the M6.2 earthquake event was the result of the activation of complex fault systems; the intersection of two regional faults (longitudinal and transverse ones) to the strike of the Dinarides that were probably inherited since the formation of the fold-and- thrust belt [1, 2]. Both fault systems consist of multiple faults with horizontal (strike-slip) block movements. Beside the main activated faults (Figure 1), there were other conjugated faults that caused Proceedings of 1st Croatian Conference on Earthquake Engineering, 1CroCEE Zagreb, Croatia - March 22nd to 24nd, 2021 Edited by Laksusic, S. and Atalic, J. Copyright © 2021 CroCEE linear surface cracks and sand spills, because of the liquefaction within the uppermost part of superficial deposits in the plains of Kupa, Glina and Sava rivers. Figure 1. a) Geological map [3] showing the main activated faults (thick black lines) during the Petrinja 2020 sequence [1]. Red dots and numbers mark locations of the other figures. The active tectonics of the territory of Republic of Croatia is caused by the continuous movement of the Adriatic lithospheric microplate (Adria) to the north [4]. Therefore, the strain occurs in the upper parts of the Earth's crust. When the strain reaches the critical level, individual faults from that system are becoming (re)activated. Considering this fact, the other potential epicentre areas in Croatia are also vulnerable in case of similar earthquake event. Besides, what we learned from the Petrinja event, is that potential aseismic (creeping) faults [6] exist in Croatia. The creeping faults must be investigated in the future, and considered during design and construction of the capital infrastructural objects. According to the earthquake resistant design provisions in compliance with Eurocode 8 [7], the peak ground acceleration (PGA) and local site amplification effects should be considered [1]. However, the Petrinja earthquake effects raised the question of a damage on lifelines crossing active fault lines. Furthermore, the question is not reliable only in the cases of strong crustal block movements that cause Proceedings of 1st Croatian Conference on Earthquake Engineering, 1CroCEE Zagreb, Croatia - March 22nd to 24nd, 2021 Edited by Laksusic, S. and Atalic, J. Copyright © 2021 CroCEE coseismic surface ruptures along the active faults, but also in the cases of the aseismic active faultssuch is Petrinja creeping fault. Thus, a special attention should be given to geological and seismological characteristics of a terrain during the strategic planning of the infrastructure, as well as to the specific microlocations with respect to the active faults. Furthermore, construction plans for important infrastructural lifelines should be accompanied with analyses of possible active faults crossing the area, as well as analyses of (micro) seismological site effects that can strongly influence the coseismic ground acceleration at specific superficial geological deposits and certain soil types. The authors recently published first scientific results on the Zagreb 22 March 2020 event [8], as well as on the active tectonics in Kvarner region [9], and we are currently still working on the topic [10]. Besides, a new Croatian Science Foundation (HRZZ) project has just been started with special attention on soil dynamic properties and its influence on the seismic hazard of the selected cultural buildings in Trakošćan, Šibenik and Dubrovnik [11]. Both project themes are closely related to the Petrinja 2020 earthquake that was characterized also by an unusual damage, and that is why we focused the last months to the devastating event. 2. Field observations on coseismic lifeline damage During the Petrinja M6.2 earthquake sequence in 2020, there were several observed cases of lifeline damage crossing the active fault lines, that include roads, bridges, pipelines and artificial riverbanks. 2.1 Roads Numerous reports in media allowed quick online research of the ground surface failures and infrastructure damage that appear along approx. 30 km long portion of sinistral NE-SW striking Petrinja Fault (Figure 1). A coseismic damage was observed in two locations on the Petrinja-Brest road (Figures 2a and 2b). A quick field inspection revealed that cracks on the road, built on the bedrock of Hrastovička gora at Župić, appeared mostly along Pokupsko Fault, and revealed the clear dextral coseismic strike- slip displacements (Figure 2c). Figure 2. a) Coseismic cracks and small transpressional structure along one of the fault lines of the creeping sinistral Petrinja Fault crossing Petrinja-Brest road south of Brest (CREDIT: Public media); b) Coseismic dextral ~10 cm displacement (white arrows) and tensional cracks (black arrows) along the main fault line of the Pokupsko Fault crossing Petrinja-Glina road west of Župić. (CREDIT: M. Vukovski, HGI) 2.2 Bridges Beside the cracked road along the Petrinja Fault north and south of Brest Bridge on Kupa River, there was a significant damage on the bridge itself, since the bridge was possibly slightly rotated between the two sinistral faults that belong to Petrinja Fault zone (Figure 3a). The new bridge at Galdovo (Sisak) on Sava River has been displaced along a left-lateral fault line striking N-S that is still not mapped (Figure 3b). The bridge is displaced for ~10 cm over the eastern basement (Figure 3c). The bridge on Glina River at Prekopa was cracked and displaced left-lateral for a few cm along the Petrinja-Glina Fault line (Figure 3d). Proceedings of 1st Croatian Conference on Earthquake Engineering, 1CroCEE Zagreb, Croatia - March 22nd to 24nd, 2021 Edited by Laksusic, S. and Atalic, J. Copyright © 2021 CroCEE Figure 3. a) Coseismic tensional cracks south of Brest Bridge located between two fault lines of the creeping sinistral Petrinja Fault (CREDIT: Public media); b) Coseismic sinistral displacement along N-S fault line of the activated complex fault system crossing the Galdovo Bridge (Sisak); c) shifted construction of Galdovo Bridge (thick arrow) because of sinistral movement (thin arrow) of
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